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Potential of colour-infrared digital camera imagery for inventory and mapping of alien plant invasions in South African shrublands

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Australian Acacia plant species invade the fynbos biome of southern Africa and threaten the exceptionally high plant diversity in the Cape Floristic Region. We examine the utility of very-high spatial resolution (0.5 m) colour infrared (CIR) digital image data for discriminating Acacia species from native fynbos vegetation, other alien vegetation and bare ground. Image data were acquired at a very low cost with a single-chip, digital CIR camera mounted on a light aircraft. Shrub and tree features were uniquely identified using visual or computer-assisted interpretation. However, increases in dynamic range and accuracy of interpolation schemes for the single chip sensor will be required if semi-automatic and accurate mapping of invasive plants is to be achieved.

Document Type: Research Article


Affiliations: 1: Department of Geography, San Diego State University, 5500 Campanile Drive, San Diego, CA 92182 4493, USA 2: Institute for Plant Conservation, University of Cape Town, University Avenue, Rondebosch, South Africa

Publication date: 2000-10-15

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